1 /* Main simulator entry points specific to Lattice Mico32. 2 Contributed by Jon Beniston <jon@beniston.com> 3 4 Copyright (C) 2009-2019 Free Software Foundation, Inc. 5 6 This file is part of GDB. 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 3 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 20 21 #include "sim-main.h" 22 #include "sim-options.h" 23 #include "libiberty.h" 24 #include "bfd.h" 25 26 #ifdef HAVE_STDLIB_H 27 #include <stdlib.h> 28 #endif 29 30 /* Cover function of sim_state_free to free the cpu buffers as well. */ 31 32 static void 33 free_state (SIM_DESC sd) 34 { 35 if (STATE_MODULES (sd) != NULL) 36 sim_module_uninstall (sd); 37 sim_cpu_free_all (sd); 38 sim_state_free (sd); 39 } 40 41 /* Find memory range used by program. */ 42 43 static unsigned long 44 find_base (bfd *prog_bfd) 45 { 46 int found; 47 unsigned long base = ~(0UL); 48 asection *s; 49 50 found = 0; 51 for (s = prog_bfd->sections; s; s = s->next) 52 { 53 if ((strcmp (bfd_get_section_name (prog_bfd, s), ".boot") == 0) 54 || (strcmp (bfd_get_section_name (prog_bfd, s), ".text") == 0) 55 || (strcmp (bfd_get_section_name (prog_bfd, s), ".data") == 0) 56 || (strcmp (bfd_get_section_name (prog_bfd, s), ".bss") == 0)) 57 { 58 if (!found) 59 { 60 base = bfd_get_section_vma (prog_bfd, s); 61 found = 1; 62 } 63 else 64 base = 65 bfd_get_section_vma (prog_bfd, 66 s) < base ? bfd_get_section_vma (prog_bfd, 67 s) : base; 68 } 69 } 70 return base & ~(0xffffUL); 71 } 72 73 static unsigned long 74 find_limit (SIM_DESC sd) 75 { 76 bfd_vma addr; 77 78 addr = trace_sym_value (sd, "_fstack"); 79 if (addr == -1) 80 return 0; 81 82 return (addr + 65536) & ~(0xffffUL); 83 } 84 85 /* Create an instance of the simulator. */ 86 87 SIM_DESC 88 sim_open (kind, callback, abfd, argv) 89 SIM_OPEN_KIND kind; 90 host_callback *callback; 91 struct bfd *abfd; 92 char * const *argv; 93 { 94 SIM_DESC sd = sim_state_alloc (kind, callback); 95 char c; 96 int i; 97 unsigned long base, limit; 98 99 /* The cpu data is kept in a separately allocated chunk of memory. */ 100 if (sim_cpu_alloc_all (sd, 1, cgen_cpu_max_extra_bytes ()) != SIM_RC_OK) 101 { 102 free_state (sd); 103 return 0; 104 } 105 106 if (sim_pre_argv_init (sd, argv[0]) != SIM_RC_OK) 107 { 108 free_state (sd); 109 return 0; 110 } 111 112 /* The parser will print an error message for us, so we silently return. */ 113 if (sim_parse_args (sd, argv) != SIM_RC_OK) 114 { 115 free_state (sd); 116 return 0; 117 } 118 119 #if 0 120 /* Allocate a handler for I/O devices 121 if no memory for that range has been allocated by the user. 122 All are allocated in one chunk to keep things from being 123 unnecessarily complicated. */ 124 if (sim_core_read_buffer (sd, NULL, read_map, &c, LM32_DEVICE_ADDR, 1) == 0) 125 sim_core_attach (sd, NULL, 0 /*level */ , 126 access_read_write, 0 /*space ??? */ , 127 LM32_DEVICE_ADDR, LM32_DEVICE_LEN /*nr_bytes */ , 128 0 /*modulo */ , 129 &lm32_devices, NULL /*buffer */ ); 130 #endif 131 132 /* check for/establish the reference program image. */ 133 if (sim_analyze_program (sd, 134 (STATE_PROG_ARGV (sd) != NULL 135 ? *STATE_PROG_ARGV (sd) 136 : NULL), abfd) != SIM_RC_OK) 137 { 138 free_state (sd); 139 return 0; 140 } 141 142 /* Check to see if memory exists at programs start address. */ 143 if (sim_core_read_buffer (sd, NULL, read_map, &c, STATE_START_ADDR (sd), 1) 144 == 0) 145 { 146 if (STATE_PROG_BFD (sd) != NULL) 147 { 148 /* It doesn't, so we should try to allocate enough memory to hold program. */ 149 base = find_base (STATE_PROG_BFD (sd)); 150 limit = find_limit (sd); 151 if (limit == 0) 152 { 153 sim_io_eprintf (sd, 154 "Failed to find symbol _fstack in program. You must specify memory regions with --memory-region.\n"); 155 free_state (sd); 156 return 0; 157 } 158 /*sim_io_printf (sd, "Allocating memory at 0x%x size 0x%x\n", base, limit); */ 159 sim_do_commandf (sd, "memory region 0x%x,0x%x", base, limit); 160 } 161 } 162 163 /* Establish any remaining configuration options. */ 164 if (sim_config (sd) != SIM_RC_OK) 165 { 166 free_state (sd); 167 return 0; 168 } 169 170 if (sim_post_argv_init (sd) != SIM_RC_OK) 171 { 172 free_state (sd); 173 return 0; 174 } 175 176 /* Open a copy of the cpu descriptor table. */ 177 { 178 CGEN_CPU_DESC cd = 179 lm32_cgen_cpu_open_1 (STATE_ARCHITECTURE (sd)->printable_name, 180 CGEN_ENDIAN_BIG); 181 for (i = 0; i < MAX_NR_PROCESSORS; ++i) 182 { 183 SIM_CPU *cpu = STATE_CPU (sd, i); 184 CPU_CPU_DESC (cpu) = cd; 185 CPU_DISASSEMBLER (cpu) = sim_cgen_disassemble_insn; 186 } 187 lm32_cgen_init_dis (cd); 188 } 189 190 /* Initialize various cgen things not done by common framework. 191 Must be done after lm32_cgen_cpu_open. */ 192 cgen_init (sd); 193 194 return sd; 195 } 196 197 SIM_RC 198 sim_create_inferior (sd, abfd, argv, envp) 199 SIM_DESC sd; 200 struct bfd *abfd; 201 char * const *argv; 202 char * const *envp; 203 { 204 SIM_CPU *current_cpu = STATE_CPU (sd, 0); 205 SIM_ADDR addr; 206 207 if (abfd != NULL) 208 addr = bfd_get_start_address (abfd); 209 else 210 addr = 0; 211 sim_pc_set (current_cpu, addr); 212 213 /* Standalone mode (i.e. `run`) will take care of the argv for us in 214 sim_open() -> sim_parse_args(). But in debug mode (i.e. 'target sim' 215 with `gdb`), we need to handle it because the user can change the 216 argv on the fly via gdb's 'run'. */ 217 if (STATE_PROG_ARGV (sd) != argv) 218 { 219 freeargv (STATE_PROG_ARGV (sd)); 220 STATE_PROG_ARGV (sd) = dupargv (argv); 221 } 222 223 return SIM_RC_OK; 224 } 225